This disclosure describes, inter alia, materials, devices, kits and methods that may be used to treat chronic sinusitis. An implant is configured to fit inside of the middle meatus of a human nasal cavity. The implant includes a therapeutic-agent formulation containing a layer of over 2000 micrograms of mometasone furoate. The implant releases the mometasone furoate for more than 12 weeks. A second implant can also be provided configured to fit inside the middle meatus. The second implant also includes a therapeutic-agent formulation containing a layer of over 2000 micrograms of mometasone furoate, and releases the mometasone furoate for more than 12 weeks.
